Electric drive for looms, weaving machines, and the like



June 18, 1935. F. P|||| Y 2,005,663

ELECTRIC DRIVE FOR LOOMS, WEAVING MACHINES AND THE LIKE Filed July 13, 1935 Patented June 18, l1935 UNITED STATES ELECTRIC DRIVE FOR LOOMS, WEAVING MACHINES, AND THE LIKE Fernand Phily, Lyon, France Application July 13, 1933, Serial No. 680,321 In Germany July 18, 1932 6 Claims.

In looms, weaving machines and other machines of a similar nature, it is desirable, or even necessary, for the machine to stop in a certain position when brought to a standstill. In looms, for instance, the sley should be in its final position next the fabric when the loom is stopped, as it is only when the sley is in this position that incidental adjustments such as knotting threads can be performed conveniently. In many cases, a certain position is desirable for re-starting the machine. It is preferable, for instance, that, when a loom is started, the crankshaft shall make a full rotation before the rst shot takes place, so that the driving motor has attained its working speed for this first shot, which then has the necessary force. Up till now, the machine, after being stopped, was brought into the desired position by hand. f

The object of the present invention is an electric drive for looms, weaving machines etc., which, when switched off, automatically causes the rotor of the machine to be brought into the desired position. In accordance with the present invention, when the driving motor is switched off, after having been running in its normal direction of rotation, it is automatically switched on again for a short space of time, but in the reverse direction of rotation. When the rotor of the machine reaches the desired position, .the driving motor is automatically switched off finally. `For switching on the driving motor, solenoid switches are used, which can be locked with respect to each other either mechanically or electrically. The solenoid control current for the reverse rotation is under the control of a switch, the actuation of which is dependent on the position of the rotor of the machine and is effected by means of' a disc provided with a suitable curve or cam, the said disc being connected to the crankshaft or a similar part of the machine. v

The illustrations show examples of the realization of the invention. Fig. 1 is a drive control system in accordance with the present invention, while Figures 2, 3 and 4 show various forms of the return-movement control.

.In Fig. 1, is the loom driving motor, 2 and 3 are the solenoid switches for switching on the motor and 4a, 4b, 4c, are the mains supplying three-phase current. The solenoid operated switches 2 and 3 are electrically interlocked with respect to each other by means of the contacts 5 and 6. The switch 2 is also provided with a retaining or holding contact The push-button switches 8 and 9 are for switching the drive on and off. The control current for the solenoid operated switch 3 is led over the contacts of a loom shaft operatedswitch II) actuated by a disc or cam |I provided with a suitable control-curve: The said disc I I, which is Xed to the crankshaft of the loom which is driven by the motor, is provided with a curved recess I2.

An electromagnetically operated switch I6 provided with actuating windings I'l having terminals I8 and I9, has its contacts connected in series between one terminal of the power supply and one terminal of the stop button 9. The electromagnetically actuated solenoid main line switch 2 is operated by the actuating winding 20, and the similar reversing line switch 3 is actuated by the actuating winding 2|. The shaft on which cam is carried is connected to motor I by a suitable gear train 28, 29. The switch I0 is normally held in an open position by spring 5I, except when the engaging end 52 of the switch rod is forced by the contour of the cam to close the contacts of switch IU. One terminal of stop button 9 is connected by wire 32 through the contacts of switch I'l to one terminal 4b of the power supply. The other terminalof stop button 9 is connected to one terminal of start button 8, and also by wire 33 to one contact of holding switch The other ter-` minal of start switch 8 is connected by wire 34 to the other terminal of holding switch and also to one terminal of actuating winding 20 of main switch 2. One contact of interlocking switch 5 actuated by winding 2|] of switch 2, is connected to one terminal 4a of the power supply. The other contact of interlocking switch 5 is connected by wire 48 to one terminal of actuating winding` 2| of reversing switch 3. The other terminal of actuating winding 2| is connected by wire 50 to one contact of shaft operated switch II), and the other contact of switch I0 is connected by wire 45 to one terminal 4b of the power supply. The terminals of reyers ing switch 3 are respectively connected by wires 36, 31, 38, to the terminals of the power supply, and the motor terminals of the switch 3 are connected to the motor respectively by wires 39, 40, 4I, through the leads 42, 43, 44, from the motor to the back contacts of the main line switch 2.

The second interlocking switch 6 is actuatable by the actuating winding 2| of the reversing switch 3, and has one contact connected by wire 46 to terminal 4a of the power supply, and has its outer contact connected by wire 49 to one terminal of actuating winding 20 of line switch 2. In Fig. 1, main line switch 2 is shown with its contacts open, and start button 8 is open,

the contacts of holding switch I are open, and the contacts of the interlocking switch 5 are closed. The contacts of reversing switch 3 are also open, and the contacts of the second interlocking switch 6 actuatable with switch 3, are closed. If actuating Winding 20 closes main switch 2, it at the same time opens the contacts of interlocking switch 5 and opens the circuit of actuating winding 2| of reversing switch 3. If actuating winding 2I of reversing switch 3 closes the main contacts of switch 3, it at the same time opens the contacts of second interlocking switch 6 which in turn opens the circuit of actuating Winding 20 of main line switch 2. It will therefore be obvious that it is impossible for the actuating windings to close both switch 2 and switch 3 at the same time.

The terminals I8 and I9 of the electromagnetic switch I 6 may be connected to some suitable electrical means actuated by operation of the machine which the motor drives and actuatable when some condition occurs requiring immediate stopping of the machine, as for example in a loom by breaking of the weft yarn feed.

In the operation of the arrangement shown in Fig. 1, the motor is in the condition of rest as shown in Fig. l, and the contacts of start button 8 are open and the contacts of stop button 9 are closed, and both main line switch 2 and the reversing switch 3 are open. The cam II is In the position corresponding to the desired angular position ofthe motor shaft. The contacts of the l weft yarn feed controlled switch I 6 are closed.

When start button 8 is pressed, current is supplied from supply terminal 4b through wires 35 and 32, through buttons 9 and 8 and wire 34 to one terminal of the actuating winding 20 of main line switch 2; Since the contacts of the second interlocking switch 6 are closed, the other terminal of actuating winding 20 of main switch 2 is connected through wires 49 and 46 to terminal 4a of the power supply. The plunger of solenoid winding 20 is actuated, and the main line switch 2 is closed, at the same time openlng the contacts of first interlocking 'switch 5, and closing the contacts of holding switch l. Since the contacts of holding switch 1 are connected across the contacts' of starting button 8, the actuating circuit closed by start button 8 is kept closed after start buttons is released. When main line switch 2 closes, current is supplied from the power supply 4 through leads 42, 43, 44 to the terminals of motor I, to cause it to drive the loom in the normal forward direction.

When the motor is to be stopped, stop button 9 is pressed which opens the circuit from power supply terminal 4b to actuating winding 20 of main line switch 2, and switch- 2 opens. At the same time, holding switch 'I opens, and rst interlocking switch 5 closes. The motor shaft will normally stop in some position other than that corresponding to the desired rest position which corresponds to the recess I2 in cam II. End 52 of the rod of switch I0 will therefore be forced by the cam periphery to close the contacts of switch I0. The circuit will be closed from supply terminal 4a through rst interlocking switch 5, wire 48, actuating winding 2I of reversing switch 3, wire 50, switch I0 and wire 45 to supply terminal 4b. Reversing switch 3 will close and power will be supplied through its front connections 36, 31, 38, and its back connections 38, 40, 4I, to motor terminals 42, 43, 44, in such a 1 heretofore explained for Fig. 1.

way that motor I will be driven in the reverse direction until such time as the motor shaft assumes the desired position corresponding to the recess I2 in the cam II, whereupon switch I8 will open and reversing switch 3 will be open. The reverse movement of the motor shaft is thus automatically provided for. When the contacts of switch I0 are open after reverse rotation of the motor due to the recess in cam II assuming the desired position, the motor is finally brought to rest. In order to prevent the loom from making any further movement after the driving motor has been disconnected; a mechanical brake can also be provided, the magnet of which is preferably connected in parallel with the eld winding of the motor.

By employing the present invention, the loom or other machineis automatically brought back into the desired rest position every time the main operating solenoid switch 2 is disconnected. It is immaterial whether the disconnecting of switch 2 is caused by manual operation of stop button 8, or by other interruption of the power supply of actuating winding 20, by other switches, as by opening of the contacts of switch I6 actuatable by the weft yarn feed. One disadvantage of the arrangement shown in Fig. 1 is that with every revolution of the crank shaft of the motor, the end 52 of the rod of switch I0 is forced back and forth by the contour of cam II, which causes rapid wear of the contacts of switch I0.

2 shows an arrangement which is more advantageous in respect to avoiding such continuous wear on the elements of switch I0. In the arrangement of Fig. 2, the rod or switch I 0 is held in its oif position and out of frictional engagement with the cam contour during the normal running of the loom or other machine..

This is accomplished by means of the solenoid I3 whose actuating winding is connected in series by wires 4'I and 56 with one terminal of second interlocking switch 6 and one terminal of actuating winding 20 of mainline switch 2. Therefore, whenever current flows through actuating winding 20 to close switch 2 and operate the motor, current is also supplied through the winding ofsolenoid I3 and the plunger rod of switch 53 is held out of contact with the periphery of cam 23. In the arrangement shown in Fig. :2, it will be desirable to give the cam a different contour than in the arrangement of Fig. 1, and the contour as shown in Fig. 2 is desirable for this purpose.

'I'he spring 54 holds the switch 53 normally closed, unless the actuating circuit of solenoid I3 is closed, or the shoulder 22 on cam 23 is in the desired position to force the actuating rod of switch 53 to open the switch. The operation of the arrangement shown in Fig. 2 is substantially the same as that of the arrangement of Fig, 1, including the-paths of the currents which traverse the different circuits and elements, as

The o'nly essential difference is, as stated, in the arrangement of Fig. 2, the end 55 of the rod of switch 53 is held out of engagement with the cam contour whenever the motor is running-forward normally. The actuating circuit of winding 20 is closed through solenoid I3 instead of being connected direct to one terminal of second interlocking switch 6 as in Fig. 1. In the arrangement of Fig. 2 also, whenever main line switch 2 opens, switch 53 is closed unless the motor happens to stop in the desired position correspondvision is made ing to the shoulder on cam 23, and reversing switch 3 will close until the motor is brought into the desired position with the shoulder on cam 23 engaging the end 55 of the rod of switch 53.

Referring to Figs. 3 and essential to prevent the loom or machine from continuing to run in the normal direction forward and thus take up an undesired or forbidden position after the main line switch 2 has been opened. In such cases. a pawl il (Fig. 3) can be provided, together with a cam 2i of suitable shape provided with the abrupt sided shoulder 2l. Profor releasing pawl Il into engagement with the shoulder of cam 25 by means of the solenoid i3 connected in series to the actuating winding 20 of main line switch 2, by opening the circuit of solenoid I3 whenever the actuating circuit of switch 2 is open. Therefore when switch 2 is open, the pawl Il drops and preventsl the loom from continuing to run 'and take up an u ndesired position. In this case, it is advantageous to provide some suitable type of resilient stopping means for absorbing the .shock when the machine is stopped suddenly. As shown in Fig. 3, the pawl YIl can at the same time constitute the means for contacting the cam contour and closing and opening the contacts of switch 51, instead of the end 55 of the switch rod as shown in Fig. 2.

Figs.- 3 and 4 are modiilcationsof the stopping and reverse drive control arrangement as shown in Fig. 2, and the elements and wiring shown in Figs. 3 and 4 are substitutes for the corresponding elements shown in the lower right corner of Fig. 2 connected to wires l5, 41, 53, 56.

Referring to Fig. 4, a machine` may have a desired and a forbidden position which it may assume when the drive is shut off. It may also occur that these two positions are very close to each other. In a loom, for instance, the desired position is with lthe sley turned away from the fabric, while the sley must under no circumstances assume the beating-up position when the shuttle has not yet reached the opposite shuttle box and the drive is automatically shut oiI by means of the weft stop motion etc. In such cases,

'the cam has the shape to be seen in the example shown in Fig. 4, as cam 21. In this case, a brake action byv reversing the current andthe reverse motion of the rotor of themachine cnlytake place when the pawl Ilengages in the recess I! of the disc 21,when vthe switch 2 is switched oil. If the machine is in another position, when the drive is switched off, the vreverse current is not switched on, but the machines momentum causes it to continue running until the rotor reaches the desired position.

The use of my invention is in no wise limited to looms and weaving machines. ft can also be used for other machines, which have desired or undesired positions. It is also possible to have any particular one of these "desired or undesired positions, for example, by giving the disc or cam a suitable shape.

Havingvnow particularly described'and ascertained the nature f my invention and the manner in which it is to be performed, what I claim is:

1. In an electric rotary drive system, a source of electric power, a reversible electric motor, an electrically actuatable main line switch connected for connecting said source to saidv motor in such manner as to cause forward rotation of said motor, an electrically actuatable reversing switch connected for connecting said source to said motor in such manner as to cause reverse rotation o! said motor, interlocking means respectively 4,insomecases it isactuatable by the closing of said main switch and said reversing switch and connected respectively to the actuating circuits'of said main switch and said reversing switch in such manner that only one of said switches canclose at one time, and shaft-operated electric switch means connected in the actuating circuit'of said reversing switch and actuatable motor in such manner that the actuating circuit of said reversing switch is open-only when said shaft occupies a particular determined angular position and is closed in all other positions of said 2. In an electric rotary drive system, a source of' electric power, a reversible electric motor, an electrically actuatable main line switch connected for connecting said source to said motor in such manner as to cause forward rotation of said motor, an electrically actuatable reversing switch connected for connecting said source to said motor in such manner as to cause reverse rotation of said-motor, Ainterlocking means respectively actuatable by the closing of said main switch and said reversing switch and connected respectively to the actuating circuits of said main switch and said reversing switch in such manner that only one of said switches can close at one time,'shaftoperated electric switch means con-1 nected in the actuating circuit of said reversing switch and actuatable by rotation of the shaft of saidmotor in such manner that the actuating circuit of said reversing switch is open only when said shaft occupies a particular determined angular position and is closed in all other positions of said shaft, and electrical means actuatable by the closing of the actuating circuit of said main switch for holding said shaft operating means .in a frictionless position with reference to rotation of said shaft.

3. In an electric rotary drive system, a source of electric power, a reversible electricmotor, an electrically actuatable main line switch conn ected for connecting said source to said motor in such manner as to cause forwardrotation of said motor, .an electrically actuatable reversing switch connected for connecting said source to said motor in such manner as to cause reverse rotation of said motor,l a first interlocking switch actuatable into the closed position when said main switch is open, a second interlocking switch actuatable into the closed position when said reversing switch is open, the contacts of said first interlocking switch being connected between one terminal of said source and one terminal of the actuating winding of said reversing switch, the contacts of said second interlocking switch being connected between said terminal of said source and one terminal of the actuating winding of said main switch, a starting switch connected between the other terminal of said actuating winding of said main switch and a second terminal of said source, and a shaft-operated 4switch having its contacts respectively connected to said second terminal of said source and the other terminal of .the actuating winding oflsaid reversing switch, said shaft-operated switch being actuatable by by rotation of the shaft of saidv rotation of the shaft of said motor in such manner that said switch is open only when said shaft a'Lsource-r Y such manner as to cause forward rotation of said motor, an electrically actuatable reversing switch connected for connecting said source to said motor in such manner as to cause reverse rotation of said motor, interlocking means respectively actuatable by the closing of said main switchand said reversing switch and connected respectively to the actuating circuits of said main switch and said reversing switch in such manner that only one of said switches can close at one time, a cam carried by the shaft, of said motor, and cam-op erated electric switch means connected in the actuating circuit of said reversing switch and actuatable by said cam, said cam being so shaped that said cam-operated switch means is actuated *into the open position only when said shaft occupies a particular determined position, andA is closed for all other positions of said shaft.

5. In an electric rotaryrdrive system, a source of electric power, a reversible electric motor, an electrically actuatable main line switch connected for connecting said source to said motor in such 4 manner as to causeforward rotation of said motor, an electrically actuatable reversing switch connected for connecting said source to said motor in such manner as to cause reverse rotation of said motor, interlocking means respectively actuata-ble by the closing of said main switch and said reversing switch and connected respectivelyto the actuating circuits of said main switch and said reversing switch in such manner that only one of said switches can close at one time, a cam carried by the shaft of said motor, cam-operated electric switch means connected in the actuating circuit of said reversing switch and actuatable by said cam, said cam being so shaped and said that said cam-operated switch means is actuated into the open position only when said shaft occupies aparticular determined position, and is closed for all other positions of said shaft, and electrical means actuatable by the closing of the actuating circuit of said main switch for holding said cam-operatedmeans out of engagement with said cam when said main switch is closed.

6. In an electric rotary drive system, a source of electric power, a reversible electric motor, an electrically actuatable main line switch connected forl connecting said source to said motor in such manner as to cause forward rotation of said motor, an electrically actuatable reversing switch connected for connecting said source to said motor in such manner as to cause reverse rotation of said motor, interlocking means respectively actuatable by the closing of said main Aswitch and said reversing switch and connected respectively to the actuating circuits of said main switch reversing switch in such manner that only one of said switches can close at one time, a cam carried by the shaft of said motor and being provided with a projecting shoulder abrupt on one side and sloping gradually on the other' side, a pawlmounted to engage said abrupt side Aof said shoulder, electrical means for controlling the release of said pawl into engaging position and connected for holding said pawl out of engagement with said shoulder when the actuating circuit of said main switch is closed, and electrical switch means actuatable into theA closed position by said pawl when released, said last mentioned switch means being connected for closing the actuating circuit oi said reversing switch.

FERNAND PHILY. 

